package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishPageVO;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 指定每一页按10条记录显示
     */
    private Integer PAGESIEZE = 10;

    /**
     * 新增菜品和对应的口味,由于这里是操作两张表，所以必须保证同时成功或同时失败
     * @param dishDTO
     */
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        // 向菜品表插入1条数据
        dishMapper.insert(dish);

        // 此时id已经被赋值为dishId，获取insert语句生成的主键值
        Long dishId = dish.getId();

        // 向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        // 需要判断一下，客户可能不提供口味数据过来，被允许的
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            // 向口味表中插入n条数据,(mybatis的批量插入)
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品的分页查询
     * @param dishPageQueryDTO
     */
    @Override
    public PageResult dishPageQuery(DishPageQueryDTO dishPageQueryDTO) {

//        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
//        //sql语句分页查询，自动加入limit关键字分页
//        Page<DishVO> page = dishMapper.dishPageQuery(dishPageQueryDTO);
//
//        return new PageResult(page.getTotal(),page.getResult());

        dishPageQueryDTO.setPageSize(PAGESIEZE);
        dishPageQueryDTO.setPage((dishPageQueryDTO.getPage() - 1) * PAGESIEZE);
        dishPageQueryDTO.setTotal(dishMapper.getCountName());

        List<DishPageVO> dishPageVO = dishMapper.dishPageQuery(dishPageQueryDTO);
        log.info("一共有:{}", dishPageQueryDTO.getPageSize());

        return new PageResult(dishPageQueryDTO.getTotal(), dishPageVO);
    }

    /**
     * 菜品的批量删除
     * @param ids
     * 因为是关于多张表操作的，所以要加上事物一致性
     */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品？status
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus().equals(StatusConstant.ENABLE)){
                //当前菜品处于起售中,不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否能够删除---是否被套餐关联了？
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0){
            //当前菜品被套餐关联了,不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜品数据
//        for (Long id : ids) {
//            dishMapper.delete(id);
//            //删除菜品关联的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

        // 根据菜品id集合批量删除菜品数据
        dishMapper.deleteByIds(ids);

        //根据菜品id集合批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品和对应的口味数据
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //将查询到的数据封装到DishVO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息和对应的口味信息
     * @param dishDTO
     * @return
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.getByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        // 需要判断一下，客户可能不提供口味数据过来，被允许的
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            // 向口味表中插入n条数据,(mybatis的批量插入)
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品的起售和停售
     * @param status,id
     * @return
     */
    @Override
    public void dishStatus(Integer status, Long id) {
        //根据参数1为起售,0为停售
        Dish dish = new Dish();
        dish.setId(id);
        dish.setStatus(status);
        dishMapper.update(dish);
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * C-端
     * 根据分类id查询菜品
     * @param dish
     * @return
     */
    @Override
    public List<DishVO> listWithFlavor(Dish dish){
        List<Dish> dishList = dishMapper.list(dish);
        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList){
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }
        return dishVOList;
    }
}
